Dr Sonja de New (née Kassenboehmer) is a Senior Research Fellow at the Centre for Health Economics at Monash Business School. Her research focuses on mental health economics and policy evaluation with a particular focus on the mental health of disadvantaged populations.

Her research projects investigate the impact of insecure work and financial stress on decision-making, skills, productivity and life outcomes. She is also working on several projects related to risky behaviours, in particular, the role of economic disadvantage and the evaluation of various policy changes to reduce risky behaviours.

Her articles can be found in such journals as the Economic Journal, Industrial and Labour Relations Review, Journal of Banking and Finance, Journal of Economic Behaviour and Organization, Labour Economics, Journal of Human Capital, Oxford Economic Papers, Economics Letters and Journal of Economic Psychology.

She joined IZA as a Research Affiliate in April 2012 and became a Research Fellow in February 2015.